Floyd Rose trem question (KH-2)

I posted this on the older board but there was no clear answer on my problem so I'm gonna try it here again :)

So I have a KH-2, which has a Floyd (duh :p) it's my first guitar with a Floyd...
What I want to know is how you can lock the tremolo arm so that it doesn't swirl about? I just want it to be moveable but to stay in place when I let it go...